Generate Entropy for GnuPG

Has anyone every tried to generate a GPG (or GnuPG) key? I have… and I received this error…

Not enough random bytes available.  Please do some other work to give
the OS a chance to collect more entropy! (Need 284 more bytes)

I was remotely logged into the machine (over SSH) so couldn't physically move the mouse or press keys to generate random entropy. The solution turned out to be simply running the following command in a second SSH Shell.

ls -R /

As soon as I ran that, the gpg command in the other window instantly finished creating my 2048 bit key.